使用一个列表项作为 R 中同一列表中另一个列表项的变量

Question

I want to do something like the following in R:

a <- list(
  x = 2 + 7,
  y = x + 8
)

It appears that this is not possible, though, or at least not in this way. Is there any way to use the value of x in defining y ? I know I could define two objects independently, x and y , then do list(x, y) , but I'd rather skip creating a lot of extra objects in my workspace.

Answer 1

With dplyr::lst , we can do this

library(dplyr)
lst(x = 2 + 7, y = x + 8)

-output

$x
[1] 9

$y
[1] 17